Issue with 4 equations with 4 unknowns

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I have an issue with this code, I am trying to figure out a,b,c,d

syms a b c d
equation1=2*(c*a-c)==(-.650034*a);
equation2=2*(c*b+(1.95*d))==.0271656*b;
equation3=(.6*d)+(3.3*b)==1;
equation4=(.6*c)+(3.3*a)==3.564;
sol=solve(equation1,equation2,equation3,equation4)
sol = struct with fields:
    a: [2×1 sym]
    b: [2×1 sym]
    c: [2×1 sym]
    d: [2×1 sym]

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Kaouter Essakkat 2022-3-2

I need exact values for a,b,c,d and i get (2*1 sym). My answer needs to be an exact value between 0 and 1, am I using the wrong function or setting it up uncorrectly?

Cris LaPierre 2022-3-2

It appears there are 2 possible solutions to the equations. A quick check of the results shows that neither solution contains a result where all values are between 0 and 1, though.

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Answer 1

Torsten 2022-3-2

编辑：Torsten 2022-3-2

在 MATLAB Online 中打开

0 个投票

syms a b c d
equation1=2*(c*a-c)==(-.650034*a);
equation2=2*(c*b+(1.95*d))==.0271656*b;
equation3=(.6*d)+(3.3*b)==1;
equation4=(.6*c)+(3.3*a)==3.564;
sol=solve(equation1,equation2,equation3,equation4);
sol{1}.a
Brace indexing is not supported for variables of this type.
sol{1}.b
sol{1}.c
sol{1}.d
sol{2}.a
sol{2}.b
sol{2}.c
sol{2}.d

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Rachel Ong 2022-3-11

What is the maximum number of variables that dsolve can do ? I have a sytstem of equations but it doesnt seem to be working?

Torsten 2022-3-11

dsolve or solve ?

Anyway: In principle no limit for both solvers.

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Issue with 4 equations with 4 unknowns

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